As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN BATTERY CHARGER STATUS MESSAGE. DURING PREFLIGHT & STANDBY POWER CHECK, FLIGHT CREW NOTED STATUS MESSAGE APPEARED, ABLE TO ERASE MESSAGE & ACCOMPLISHED MAIN BATTERY CHARGER CHECK. UNABLE TO DUPLICATE MESSAGE AGAIN AFTER NUMEROUS TRIES. REPLACED RELAY K10424 IAW FIM24-31 & SSM24-31-01 PG101. OPERATIONS CHECKED NORMAL IAW A MM24-30-00 PG501. TRANSFERRED POWER FROM APU TO ENGINES & TAXIED AIRCRAFT, NO MESSAGES.